Does this measure salt (NaCl) or sodium (Na) ?

It measures salt (sodium chloride).

What calibration and conductivity solution do I use ?

ORAPXI salinity meter has 3-point-calibration, which means you can calibrate the meter with 1413 μS/cm, 12.88 mS/cm, 111.8 mS/cm solution seprately. Depending on your application needs. If you test hydroponic nutrient, the tester need to be calibrated 1413 μS/cm solution. If you test saltwater pool, the tester need to be calibrated 12.88mS/cm solution. If you test aquarium tank, the tester need to be calibrated 111.8 mS/cm solution. If you test all application, the tester need to be calibrated 1413 μS/cm, 12.88 mS/cm, 111.8 mS/cm calibration solution. All calibration solutions can be purchased at Amazon by searching for "1413 μS/cm calibration solution"，"12.88 mS/cm calibration solution", "111.8 mS/cm calibration solution". The calibration steps are as follows： a) Prepare 1413 μS/cm standard solution, press POWER button to turn it on. Insert the tester compound electrode into the standard solution; b) Press MODE/CAL button, adjust the tester to EC mode, the word “μS/cm” will be displayed at the left top of the screen. c) Press MODE/CAL about 4 seconds, then release the button, the “CAL” symbol will display, then a value will flash 3 times on the screen, when the value starts to flash, press down button( If the flashing value is higher than 1413μS/cm ) or up button ( If the flashing value is less than 1413μS/cm ) to adjust the reading toward 1413μS/cm. d) After adjust the displaying value to 1413 μS/cm, then release the button, waiting the reading stop flashing, the calibration is finished. The 12.88 mS/cm and 111.8mS/cm solution calibration is the same as above procedures.

Does this measure salt (NaCi) or sodium (Na) ?

Measures salinity. I use to measure the salinity in my reef tank.

can this unit also show Celsius

Yes, I believe it does, though it isn't sitting in front of me at the moment. I have found this perfect for my 600 gallon goldfish pond.

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🌟 Dive into Precision with ORAPXI!

4 IN 1 FUNCTIONALITY - Test Salinity, TDS, EC, and Temperature with a single device—efficiency at your fingertips!
PRECISION MEETS VERSATILITY - Experience accurate readings across a wide salinity range, perfect for aquariums and marine monitoring.
RELIABLE AFTER SALES SUPPORT - Enjoy peace of mind with our 30-day return policy and prompt customer service.
USER FRIENDLY BACKLIT DISPLAY - Easily read measurements in any lighting condition with our vibrant green backlit LCD.
AUTOMATIC TEMPERATURE COMPENSATION - Say goodbye to temperature-related errors with our smart ATC feature.

The ORAPXI Digital Salinity Tester is a waterproof, multi-parameter device designed for accurate salinity measurement in various aquatic environments. With a wide range of 0-200ppt and features like automatic temperature compensation and a backlit display, it’s perfect for both professionals and hobbyists. The tester is easy to use, versatile, and comes with reliable customer support.

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TrustScore 4.5 | 7,300+ reviews

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The product exactly matches the description. Very satisfied with my purchase.

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Manufacturer	ORAPXI International
Part number	LD-154
Item Weight	150 g
Product Dimensions	18.3 x 0.03 x 0.03 cm; 150 g
Batteries	3 LR44 batteries required. (included)
Item model number	LD-154
Style	Contemporary
Power source type	Battery Powered
Display Style	LCD
Special Features	Wide Salinity Range, Automatic Temperature Compensation, Backlit Display
Included components	3 LR44 batteries
Batteries Included?	Yes
Batteries Required?	Yes
Battery Cell Type	Alkaline

ORAPXI Digital Salinity Tester for Salt Water - Waterproof IP67 Salinity Meter with ATC Large Range 0-200ppt Saltwater Tester for Seawater, Aquariums, Marine Monitoring, and Koi Fish Pond

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